<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		div {
			color: red!important;
		}
		ul li {
			color: green;
		}
		li {  /*0, 0, 0, 1*/
			color: red;
		}
	</style>
</head>
<body>
	<div>
		层叠样式表
	</div>
	<nav>
		<ul>
			<li>李白</li>
			<li>程咬金</li>
			<li>鲁班1号</li>
		</ul>
	</nav>
</body>
</html>